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K2-3P275 Mersen Surge Protector Type 2 SPD 3 Pole 400 Volt 20KA TNC

K2-3P275 Mersen Surge Protector Type 2 SPD 3 Pole 400 Volt 20KA TNC

Mersen 44020300 K2-3P275 Type 2 three-pole surge protection device for 230/400 V TN-C systems with 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.

SKU: 44020300Alt SKU: K2-3P275MPN: 44020300
Price
List Price £103.85 ex VAT
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Why Choose the Mersen 44020300 K2-3P275 Surge Protection Device?

The Mersen 44020300, also identified as the K2-3P275, is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase low-voltage electrical installations against transient overvoltages. Part of the trusted Mersen Surge-Trap K2 series, it provides reliable protection for 230/400 V TN-C electrical systems, helping safeguard switchgear, motors, drives and sensitive electronic equipment from lightning-induced surges and switching transients.

The K2-3P275 features a compact pluggable construction that allows the protection cartridges to be replaced without removing the complete DIN-rail base. A clear visual status indicator enables quick inspection of the operational condition, simplifying routine maintenance and ensuring continuous surge protection.

With a 230/400 V AC nominal operating voltage, a 275 V AC maximum continuous operating voltage, a 20 kA nominal discharge current and a 50 kA maximum discharge current, the Mersen 44020300 delivers dependable protection for commercial buildings, industrial facilities and infrastructure installations. Its three-module DIN-rail design makes installation straightforward within distribution boards and motor control centres.

Key Advantages

  • Reliable Type 2 surge protection for three-phase TN-C electrical systems.
  • 50 kA maximum discharge current for excellent transient overvoltage protection.
  • Compact pluggable construction for simplified maintenance.
  • Visual operating status indicator for rapid inspection.
  • High short-circuit withstand capability.
  • Suitable for commercial, industrial and infrastructure installations.

Key Features

  • Mersen Surge-Trap K2 series.
  • Type 2 / Class II surge protection device.
  • 3+0 internal configuration.
  • Three-pole design.
  • 230/400 V AC nominal operating voltage.
  • 275 V AC maximum continuous operating voltage (Uc).
  • 20 kA nominal discharge current (In).
  • 50 kA maximum discharge current (Imax).
  • Protection mode: L-PE(N).
  • Dynamic thermal disconnection.
  • Visual operating status indicator.
  • Pluggable DIN-rail construction.

Reliable Surge Protection for Three-Phase Electrical Systems

Transient overvoltages generated by indirect lightning strikes, utility switching and inductive electrical loads can damage PLCs, motor drives, switchgear, communication equipment and power supplies. Installing a dedicated Type 2 surge protection device helps reduce costly equipment failures while improving electrical system reliability.

The Mersen K2-3P275 combines high surge current capability, fast response and replaceable protection cartridges, providing dependable long-term protection whilst simplifying routine maintenance in commercial and industrial installations.

Typical Applications

  • Three-phase TN-C distribution boards.
  • Industrial switchgear and motor control centres.
  • Commercial electrical installations.
  • Manufacturing and process automation.
  • Building services and infrastructure projects.
  • Protection of drives, PLCs and sensitive electronic equipment.

Technical Specifications

Voltage 400 V
Phase Three Phase
Manufacturer Mersen
Series Surge-Trap K2
Model K2-3P275
SKU / Part number 44020300
Product type Surge protection device
IEC SPD classification Type 2 / Class II
UL SPD classification Type 1 Component Assembly
Internal configuration 3+0
Number of poles 3
Network configuration TN-C
Protection mode L-PE(N)
Nominal operating voltage 230/400 V AC
Maximum continuous operating voltage 275 V AC
Nominal discharge current 20 kA
Maximum discharge current 50 kA
Voltage protection level ≤1.5 kV
Response time ≤25 ns
Residual current <1 mA
Short-circuit withstand rating 25 kA
Maximum back-up fuse 315 A gG
Dynamic thermal disconnection Yes
Status indication Green (OK) / Not green (replace)
Protection rating IP20
Mounting type DIN rail
DIN rail modules 3
Terminal tightening torque 3 Nm
Replacement cartridge Mersen 44020001
Dimensions (H × W × D) 90 × 54 × 74.4 mm
Weight approx. 0.362 kg
EAN 8435297889885
RoHS compliant Yes
HS Code 85363090
Country of Manufacture Spain
Poles 3-pole
Device Type Surge protection device
SPD Type Type 2
Earthing System TN-C
Nominal Discharge Current (In) 20 kA
Remote Signal No

Frequently Asked Questions

What is the Mersen 44020300 used for?

The Mersen 44020300 protects three-phase TN-C electrical installations against transient overvoltages caused by lightning activity, switching operations and inductive loads.

What type of surge protection device is the K2-3P275?

It is a Type 2 / Class II surge protection device designed for secondary surge protection in three-phase low-voltage electrical installations.

What discharge current can the device withstand?

The K2-3P275 is rated for a 20 kA nominal discharge current and a 50 kA maximum discharge current using the standard 8/20 µs surge waveform.

Does the Mersen 44020300 include remote signalling?

No. This model provides local visual status indication only. For applications requiring remote monitoring, Mersen also offers the K2-3P275-M variant.

Can the protection cartridges be replaced?

Yes. The pluggable design allows the protection cartridges to be replaced without removing the complete DIN-rail base, reducing maintenance time.

Trusted Surge Protection from Mersen

Mersen Surge-Trap K2 surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to protect critical three-phase electrical systems against damaging transient overvoltages.

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